How to Convert Milligrams to Teaspoons

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Reviewed by Anne Schmidt

Last Updated: March 7, 2025 Fact Checked

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Converting Milligrams to Milliliters

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Converting Milliliters to Teaspoons

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A milligram is a measure of mass in the SI (metric) system, while a teaspoon is a measure of volume in the English system. Therefore, this conversion from milligrams to teaspoons requires two stages. First you will need to find the density of the material you are measuring. You will use the density to convert from mass to volume, or milligrams to milliliters. You will then convert from the SI volume measurement milliliters to the English system measurement teaspoons.

Part 1

Part 1 of 2:

Converting Milligrams to Milliliters

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1
Find the density of the material you are measuring. Because you are trying to convert mass into volume, you need to know the density of the material. Density is a measurement of how much mass fits in a given volume for any substance. Materials that we consider "heavy" have a high density, while "light" materials have a low density.^{[1]
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- Density tables exist online or in many text books for a wide range of substances. You can find a table of density values by searching for “density table,” “liquid density table,” or “solid density table.”
- The density of pure water is set at 1000 kg per cubic meter. This is the same as 1000 mg/ml.
- For comparison, some other common liquids have the following densities:^{[2]
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  - Alcohol = 800 kg/m³=800 mg/ml
  - Gasoline = 737 kg/m³=737 mg/ml
  - Milk = 1050 kg/m³=1050 mg/ml
  - Mercury = 13590 kg/m³=13590 mg/ml
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Check with your pharmacist for medication densities. If you are trying to convert amounts for a prescription, you should check with your pharmacist. A pharmacist is in the best position to provide you with the correct density of whatever compound you need to measure.
- You may find the density of your substance printed on the bottle. You might check that before contacting the pharmacist.
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Prepare to convert from mass to volume. Recall that density is equal to an item’s mass divided by its volume. Rearranging this formula.^{[3]
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- ${\text{Volume}}={\frac {\text{mass}}{\text{density}}}$ .
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Perform the conversion. When you know the density of the material and the measurement of the sample you wish to convert, perform the division to convert from mass to volume of your substance.^{[4]
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- For example, suppose you wish to convert 20,000 milligrams each of water, alcohol, gasoline, milk and mercury into milliliters. 20,000 milligrams is equal to 20 grams, which is about the weight of 20 paper clips. The conversions for these five liquids are as follows:
  - Water: $(20,000{\text{ mg}})/(1000{\text{ mg/ml}})=20{\text{ ml water}}$
  - Alcohol: $(20,000{\text{ mg}})/(800{\text{ mg/ml}})=25{\text{ ml alcohol}}$
  - Gasoline: $(20,000{\text{ mg}})/(737{\text{ mg/ml}})=27.137{\text{ ml gasoline}}$
  - Milk: $(20,000{\text{ mg}})/(1050{\text{ mg/ml}})=19.048{\text{ ml milk}}$
  - Mercury: $(20,000{\text{ mg}})/(13590{\text{ mg/ml}})=1.4717{\text{ ml mercury}}$

Part 2

Part 2 of 2:

Converting Milliliters to Teaspoons

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1
Learn the conversion factor. Because milliliters and teaspoons are both measurements of volume, the density of the different materials no longer makes a difference. Converting from milliliters to teaspoons is fairly easy because the conversion factor is just 5 to 1. That is, 5 ml = 1 tsp.^{[5]
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- If you know a measurement in milliliters, you can convert to teaspoons by just dividing by 5.
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Perform the conversion. Using the five samples from above, prepare for the conversion to teaspoons.
- Water: 20,000 mg = 20 ml/5 = 4 teaspoons
- Alcohol: 20,000 mg = 25 ml/5 = 5 teaspoons
- Gasoline: 20,000 mg = 27.137 ml/5 = 5.4274 teaspoons
- Milk: 20,000 mg = 19.048 ml/5 = 3.8096 teaspoons
- Mercury: 20,000 mg = 1.4717 ml/5 = 0.29434 teaspoons
Pure water is set as the standard for conversion density, with a density of 1.0 grams per milliliter. The densities of all other substances are set in relation to the density of water. Notice that mercury, with an extremely high density, converts to only about a quarter teaspoon for the same mass of water that equals one teaspoon.^{[6]
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How many teaspoons are in 10 mg of fiber?

Donagan

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As indicated above, you have to know the density of the material before you can answer that question.

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How many teaspoons is 400 mg of turmeric?

Donagan

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There are roughly 2,267 mg of turmeric in a teaspoon, so 400 mg would be about 0.176 tsp (one-sixth of a teaspoon). (A teaspoon is slightly different in Australia.)

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How do I convert milligrams to meters?

Donagan

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Milligrams measure mass, and meters measure length, so one does not convert to the other.

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Tips

After you get good at converting, you can perform this conversion quite quickly. Divide the number of milligrams by the density (in mg/ml), then divide by 5 to get teaspoons.

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